4QNP:
reference: Structural characterization of a protective epitope spanning A(H1N1)pdm09 influenza virus neuraminidase monomers., Wan H, Yang H, Shore DA, Garten RJ, Couzens L, Gao J, Jiang L, Carney PJ, Villanueva J, Stevens J, Eichelberger MC, Nat Commun. 2015 Feb 10;6:6114. doi: 10.1038/ncomms7114. PMID: 25668439

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